Okie doke. I just replaced the tired, old and flaky trimmers on my
TR7's power supply board with precision trimpots. I've done this on two
other TR7s without incident. This time, however, powering up blows the
rig's internal 5 amp fuse.
Could this be caused by an overvoltage condition on the 10 volt line?
After installing the new trimpots, I began the alignment sequence, as
usual, by measuring the voltage on the line. It read 13 + volts. The
fuse blew moments later before I could adjust the 10 volt line's new
trimpot.
The real mystery, however, is why the same thing now happens when I
substitute an unmodified known-to-be-working power supply board. This
rig was trouble-free before I "fixed" it, of course. Yeah -- I know,
"if it broke, don't fix it...", but....
What condition(s) would take out the 5A fuse?
Many thanks and 73,
Craig
W3CRR
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